Abstract

We have proposed a graded gratingplasmonic system with a significant slow-light effect for the propagation of high-confinement surface plasmon (SP) wave.Theoretical analysis and numerical simulations show that the localized position of SP wave in the plasmonicwaveguide is dependent on the operating frequency. It is found that the slow-light effect exhibits an obvious enhancement with propagation. The proposed ultracompact configuration offers the advantage of a large trapping bandwidth of 90 THz, which may find excellent applications on slow-light systems, especially optical buffers.